Qt QTouchEvent 多点触控

 首先设置接收触控事件    setAttribute(Qt::WA_AcceptTouchEvents, true);

bool CollectionPoint::event(QEvent *event)
{
	switch (event->type()) {
	case QEvent::TouchBegin:
	case QEvent::TouchUpdate:
	case QEvent::TouchEnd:
	{
		m_pos.clear();
		QTouchEvent *touchEvent = static_cast<QTouchEvent *>(event);
		QList<QTouchEvent::TouchPoint> touchPoints = touchEvent->touchPoints();
			for (int i = 0; i < touchPoints.count(); i++)
			{
				const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.at(i);
				QPoint point0 = mapToGlobal(touchPoint0.pos().toPoint());
				POINTINFO info;
				info.id = QString::number(i);
				info.x = touchPoint0.pos().toPoint().x();
				info.y = touchPoint0.pos().toPoint().y();
				switch (touchPoints.at(i).state())
				{

				case Qt::TouchPointPressed:
				{
					info.iState = 7;
				}
				break;
				case Qt::TouchPointMoved:
				{
					info.iState = 7;
				}
				break;
				case Qt::TouchPointReleased:
				{
					info.iState = 6;

				}
				break;

				default:
					break;
				}
				m_pos.append(info);
			}
		

		update();
		sendPos();
		return true;
	}
	default:
		break;
	}
	return QWidget::event(event);
}